1. Department of Biological Sciences; University of Alabama; Tuscaloosa Alabama USA
2. Rocky Mountain Research Station; U.S. Forest Service; Fort Collins Colorado USA
3. National Ecological Observatory Network Inc.; Boulder Colorado USA
4. Institute of Arctic and Alpine Research; University of Colorado Boulder; Boulder Colorado USA
5. Department of Biological Sciences; Florida International University; Miami Florida USA
6. Natural Resource Ecology Laboratory; Colorado State University; Fort Collins Colorado USA
7. Department of Biology; West Chester University of Pennsylvania; West Chester Pennsylvania USA